Mask
This screen allows you to configure Crime Catcher to use a mask with the motion detection. You can simply 'draw' out the areas which you don't want to be processed for motion. To create a mask, go into the options and click on Masks.
You will then be able to choose a mask which you have already created or draw a new one. To create a new mask or check how one fits with the current image click on 'Create / View Mask'. This will open a new window which will allow you to draw out areas which you DON'T want to be processed for motion.